CRYSTALLOGRAPHIC STUDIES ON LMH-2.

Abstract

The synthesis of LMH-2 until recently has been plagued by the low density of the product. In an effort to determine the theoretical density of LMH-2, attempts have been made to index X-ray powder photographs of the material. These attempts have thus far been frustrated by low symmetry and lack of purity of phase and composition. An in-house program was initiated at Air Force Rocket Propulsion Laboratory to complement contractual research in this area. Microscopic studies of reported polymorphic transitions were investigated and found to be inconclusive. An early powder diffraction pattern of BeH2 has been shown to be indexed incorrectly. A radial distribution analysis of the glassy phase of LMH-2 was carried out using X-ray diffraction methods. The results of the analysis confirm the theoretical tetrahedral four-fold coordination proposed for the cation. The implications of the coordination in terms of possible densities is reviewed with respect to the densities of SiO2 polymorphs. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1965
Accession Number
AD0369285

Entities

People

  • Charles M. Bock
  • Robert E. West

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Absorbers (Materials)
  • Advanced Materials
  • Air Force
  • Buildings And Structures
  • Diffraction
  • Engineered Materials
  • Low Density
  • Materials
  • Photographs
  • Photography
  • Research Facilities
  • Rocket Propulsion
  • Symmetry
  • Transitions
  • X Rays
  • X-Ray Diffraction

Readers

  • Educational Psychology
  • Materials Science and Engineering.